package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * 作者：24岁没牵过女人的手
 * 日期：2023/3/9 14:28
 * 文件描述：
 */
@Component
public class RedisIdWorker {

    private static final long BEGIN_TIMESTAMP = 1640995200L;

    /**
     * 序列号的位数
     */
    private static final int COUNT_BITS = 32;

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix){
        // 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        // 生成序列号
        // 获取当前的日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyy :MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        // 拼接返回
        return timestamp << COUNT_BITS | count;
    }

//    public static void main(String[] args) {
//        LocalDateTime dateTime = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
//        long second = dateTime.toEpochSecond(ZoneOffset.UTC);
//        System.out.println("second="+second);
//    }
}
